linux-kernel - Re: [PATCH 1/3 v2] slub: prefetch next freelist pointer in __slab

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Message-ID: <CAAmzW4P8itKqMLLUqAAtT7GakKecCixd0PV8y0LgFOL+=g_tZQ@mail.gmail.com>
Date:	Thu, 5 Jul 2012 00:48:43 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/3 v2] slub: prefetch next freelist pointer in __slab_alloc()

2012/7/5 Eric Dumazet <eric.dumazet@...il.com>:
> Its the slow path. I am not convinced its useful on real workloads (not
> a benchmark)
>
> I mean, if a workload hits badly slow path, some more important work
> should be done to avoid this at a higher level.
>

In hackbench test, fast path allocation is about to 93%.
Is it insufficient?
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